Vortex Shedding on Mt Shasta
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March 26, 2010 - Vortex shedding off of the summit of Mt Shasta. The bubbles of compressed air would build up over the summit and then burrow through the lenticular cloud once it was released. After timing the movement of these 'bubbles' and checking it on a map later, I calculated them as moving at between 80-120 mph! Sometimes a 'bubble' would move faster than others and overtake and merge into a 'super bubble'.
The wavy parts of the lenticulars are where the cloud is transitioning to lee-wave clouds due to the oscillating turbulence in the air as it passes over the peak. Since we are to the north of the peak, the orientation of the 'waves' indicates that the winds are blowing over the summit mostly from the West to North West.
See the next in the series here.
Dimensioned diagram here